In her new bookWe’re Going to Need More Wine— excerpted exclusively in the new issue of PEOPLE — the star of BET’sBeing Mary Janeopens up about her struggles with infertility and failed IVF treatments.

“I have had eight or nine miscarriages,” Union, 44, writes in the book. “For three years, my body has been a prisoner of trying to get pregnant — I’ve either been about to go into an IVF cycle, in the middle of an IVF cycle, or coming out of an IVF cycle.”

While Union has spoken about IVF previously, she did not reveal the heartbreaking struggle she has faced.

But even after enduring three years of failed IVF cycles and being constantly bloated from the hormones, Union writes that she and Wade “remain bursting with love and ready to do anything to meet the child we’ve both dreamed of.”

The pairtied the knotin August 2014 and at first, the star didn’t see children as part of her future.

But, after realizing how much joy she feltraising three boyswith Wade, 35 — his nephew Dahveon Morris, 16, and sons from a previous marriage Zaire, 15, and Zion, 10 (Wade’s third son Xavier, 3, conceived with another woman while Wade and Union were broken up, lives with his mother) — Union first discovered that having a baby was something she wanted.

“I never wanted kids,” she tells PEOPLE. “Then I became a stepmom, and there was no place I’d rather be than with them.”

Dealing with infertility while being in the public eye hasn’t been easy for Union, who constantly is reminded of her struggle each time she’s asked by both family and strangers alike when she’s having kids.

“For so many women, and not just women in the spotlight, people feel very entitled to know, ‘Do you want kids?'” she says. “A lot of people, especially people that have fertility issues, just say ‘no’ because that’s a lot easier than being honest about whatever is actually going on. People mean so well, but they have no idea the harm or frustration it can cause.”

“Once a month I look like I’m in my second trimester because I’m bloated,” she says. “It leads to the questions and it leads to the rumors and anytime I go into a doctor’s office I feel like I’m a member of SEAL Team Six undercover because I don’t want people to speculate.”

By sharing her story inWe’re Going to Need More Wine, which is out Oct. 17, Union hopes that the way people approach her about the topic changes.